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Accurate Control of Core–Shell Upconversion Nanoparticles through Anisotropic Strain Engineering

Journal Article · · Advanced Functional Materials
 [1];  [2];  [1];  [3];  [1];  [4];  [3];  [5];  [6];  [3];  [1]
  1. Department of Materials Science and Engineering City University of Hong Kong 83 Tat Chee Avenue Hong Kong SAR China, City University of Hong Kong Shenzhen Research Institute Shenzhen 518057 China
  2. Department of Materials Science and Engineering City University of Hong Kong 83 Tat Chee Avenue Hong Kong SAR China, College of Materials Science and Engineering Shenzhen University Shenzhen 518060 China
  3. School of Materials Science and Engineering Zhejiang University Hangzhou 310027 China
  4. Department of Materials Science and Engineering City University of Hong Kong 83 Tat Chee Avenue Hong Kong SAR China
  5. State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China
  6. Center for Functional Nanomaterials Brookhaven National Laboratory Upton NY 11973 USA
Abstract

The effect of anisotropic interfacial strain on epitaxial growth and optical emission of sodium rare‐earth fluoride core–shell nanoparticles is investigated. A variety of sodium rare‐earth fluoride shells are grown on hexagonal‐phase NaYF 4 :Yb/Er core for providing anisotropic tuning of interfacial strains. Using high‐resolution transmission electron microscopy and X‐ray diffraction characterizations, the correlations between the epitaxial habits and the interfacial strains are quantitatively addressed. Furthermore, the growth affinity is tuned by controlling precursor concentration in conjunction with Ca 2+ doping, which results in accurate regulation of the anisotropic growth. The lattice strain resulting from mismatched epitaxy is found to enhance luminescence response of the nanoparticles to temperature change.

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0012704
OSTI ID:
1558815
Journal Information:
Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 44 Vol. 29; ISSN 1616-301X
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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